douglas firs造句

bolman has studied regional variation in douglas fir seed yields .
鲍尔曼曾研究过道格拉斯冷杉种子产量地区间的差异。
qualitative classification of softwood round timber-larches and douglas firs
圆软木的定性分类.落叶松和枞木
qualitative classification of softwood round timber . larches and douglas firs
软木圆材的定性分类.落叶松木和黄杉木
on mountain slopes that receive plentiful rainfall, huge douglas firs rise in towering columns
在有充足降水的斜坡，巨大的道格拉斯枞树高耸入云。
sawn timber-appearance grading of softwoods-european spruces, firs, pines and douglas fir
锯材.软木的外观等级.欧洲云杉木松木冷杉木和花旗松
It's difficult to find douglas firs in a sentence. 用douglas firs造句挺难的

sawn timber . appearance grading of softwoods . part 1 : european spruces, firs, pines and douglas firs
锯材.软木的外观分级.第1部分:欧洲云杉冷杉松木和黄杉
qualitative classification of softwood round timber-part 3 : larches and douglas firs; german version env 1927-3 : 1998
软圆木质量分级.第3部分:落叶松和花旗松
sawn timber-appearance grading of softwoods-part 1 : european spruces, firs, pines, douglas fir and larches
锯材.软木的外观分级.第1部分:欧洲云杉冷杉松木黄杉和落叶松
sawn timber-appearance grading of softwoods-part 1 : european spruces, firs, pines, douglas firs and larches including amendment 1 : 2002; german version en 1611-1 : 1999 a1 : 2002
锯材.软木的表面分级.第1部分:欧洲云杉冷杉松树